<template>
    <div>
       <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区 -->
            <el-alert
                title="添加商品区域"
                type="info"
                center
                show-icon
                :closable="false">
            </el-alert>
            <!-- 步骤条 -->
            <el-steps :space="200" align-center :active="activeIndex - 0" finish-status="success">
                <el-step title="基本信息"></el-step>
                <el-step title="产品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <el-form label-position="top" :model="addForm" :rules="addFormRules" ref="addFormRefs" label-width="100px">
                <!-- tab栏区域 -->
                <el-tabs :before-leave="beforeTabLeave" v-model="activeIndex" :tab-position="'left'" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input type="number" v-model="addForm.goods_price"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input type="number" v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input type="number" v-model="addForm.goods_number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="cateList"
                                :props="cateProps"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="产品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="cb" :key="i" v-for="(cb, i) in item.attr_vals"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 表示图片要上传的后台api地址 -->
                        <el-upload
                        :action="uploadURL"
                        :headers="headerObj"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        :on-success="handleSuccess"
                        list-type="picture">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce">
                        </quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button class="btnAdd" type="primary" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览对话框 -->
        <el-dialog
        title="图片预览"
        :visible.sync="previewDialog"
        width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      activeIndex: '0',
      // 添加商品的表单对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      // 添加商品的表单规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请输入商品类别', trigger: 'blur' }
        ]
      },
      //  商品分类列表
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 预览下的图片路径
      previewPath: '',
      // 图片预览对话框的显示与隐藏
      previewDialog: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败')
      this.cateList = res.data
    // console.log(res.data)
    },
    // 级联选择器中选项变化，触发这个函数
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked () {
    //   console.log(this.activeIndex)
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) return this.$message.error('获取动态参数列表失败！')
        // console.log(res)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
        console.log(res.data)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败!')
        }
        // console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewDialog = true
    },
    // 处理移除图片的操作
    handleRemove (file) {
      // 1. 获取将要删除的图片路径
      const filePath = file.response.data.tmp_path
      // 2. 从 pics 数组中，从中找到这个图片的对应值
      const index = this.addForm.pics.findIndex(item => {
        return item.pic === filePath
      })
      // 3. 调用数组splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(index, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess (response) {
    //   console.log(response)
      // 1. 拼接得到一个图片信息对象
      const picInfo = response.data.tmp_path
      // 2. 将图片信息对象 push 到 pics 数组中
      this.addForm.pics.push(picInfo)
    //   console.log(this.addForm)
    },
    add () {
      // console.log(this.addForm)
      this.$refs.addFormRefs.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单项')
        // 执行添加的业务逻辑
        // lodash cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数 和 静态属性
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // console.log(form)
        // 发起请求，添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败')
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) return this.addForm.goods_cat[2]
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 5px 5px 0 !important;
}
.previewImg {
    width: 100%;
}
.btnAdd {
    margin-top: 15px;
}
</style>
